perf python: Port gecko to perf module

Port gecko.py to a standalone script in tools/perf/python/ that uses
the perf module directly to convert perf.data profiles into Firefox
Gecko profile format.

Improvements compared to the legacy script:
- Encapsulate profiler state in GeckoCLI and CategoryData classes with
  full type annotations, removing global variables.
- Harden the local HTTP server in _write_and_launch(): write the
  temporary profile to an isolated tempfile.TemporaryDirectory() with a
  randomized UUID filename instead of the current working directory,
  bind HTTPServer exclusively to 127.0.0.1 on an OS-assigned ephemeral
  port (0), restrict CORS Access-Control-Allow-Origin to
  'https://profiler.firefox.com' instead of '*', and restrict HTTP GET
  requests exclusively to the randomized profile filename (returning
  HTTP 403 for directory listings and any other path).
- Add -i/--input and -e/--event CLI options via argparse.

Add a shell test (test_gecko_python.sh) to verify the standalone script.

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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